pip install panadas fails on numpy version
#### Code Sample, a copy-pastable example if possible

```
C:\Users\nickdmax
λ pip install pandas
Collecting pandas
  Downloading https://files.pythonhosted.org/packages/08/01/803834bc8a4e708aedebb133095a88a4dad9f45bbaf5ad777d2bea543c7e/pandas-0.22.0.tar.gz (11.3MB)
    100% |################################| 11.3MB 315kB/s
  Could not find a version that satisfies the requirement numpy==1.9.3 (from versions: 1.10.4, 1.11.0, 1.11.1rc1, 1.11.1, 1.11.2rc1, 1.11.2, 1.11.3, 1.12.0b1, 1.12.0rc1, 1.12.0rc2, 1.12.0, 1.12.1rc1, 1.12.1, 1.13.0rc1, 1.13.0rc2, 1.13.0, 1.13.1, 1.13.3, 1.14.0rc1, 1.14.0, 1.14.1, 1.14.2)
No matching distribution found for numpy==1.9.3

C:\Users\nickdmax
λ pip list
...
numpy               1.14.2
...
```

#### Problem description
I was unable to upgrade pandas (same error as above). I don't think I have ever had numpy 1.9.3 installed. Since there was a numpy directory under the current pandas directory I did an uninstall "pip uninstall pandas" to attempt to reinstall. 

#### Output of ``pip freeze``

<details>
vattrs==17.2.0                       
Automat==0.6.0                      
backcall==0.1.0                     
backports-abc==0.5                  
bleach==2.1.3                       
certifi==2017.4.17                  
chardet==3.0.4                      
colorama==0.3.9                     
constantly==15.1.0                  
cssselect==1.0.1                    
cycler==0.10.0                      
decorator==4.2.1                    
entrypoints==0.2.3                  
html5lib==1.0.1                     
hyperlink==17.3.0                   
idna==2.5                           
incremental==17.5.0                 
ipykernel==4.8.2                    
ipython==6.3.1                      
ipython-genutils==0.2.0             
ipywidgets==7.2.1                   
jedi==0.11.1                        
Jinja2==2.10                        
jsonschema==2.6.0                   
jupyter==1.0.0                      
jupyter-client==5.2.3               
jupyter-console==5.2.0              
jupyter-core==4.4.0                 
kiwisolver==1.0.1                   
MarkupSafe==1.0                     
matplotlib==2.2.2                   
mistune==0.8.3                      
nbconvert==5.3.1                    
nbformat==4.4.0                     
notebook==5.0.0                     
numpy==1.14.2                       
pandocfilters==1.4.2                
parso==0.1.1                        
pickleshare==0.7.4                  
prompt-toolkit==1.0.15              
PyDispatcher==2.0.5                 
Pygments==2.2.0                     
PyParse==1.1.7                      
pyparsing==2.2.0                    
python-dateutil==2.7.2              
pytz==2018.4                        
pywinpty==0.5.1                     
pyzmq==17.0.0                       
qtconsole==4.3.1                    
requests==2.18.2                    
Rx==1.5.9                           
scipy==0.19.1                       
simplegeneric==0.8.1                
six==1.11.0                         
testpath==0.3.1                     
tornado==5.0.2                      
traitlets==4.3.2                    
typing==3.6.4                       
urllib3==1.22                       
virtualenv==15.1.0                  
w3lib==1.17.0                       
wcwidth==0.1.7                      
webencodings==0.5.1                 
widgetsnbextension==3.2.1           
win-unicode-console==0.5            
zope.interface==4.4.2               
</details>

pip version 10.0.0

``python -c "import numpy; print(numpy.version.version)"``
1.14.2
