Release notes and doc examples for 0.10
Also using to keep milestone open
- inf_as_na API change
- Google Analytics API example
- DONE Any additional C Parser notes etc
- Excel?
- DONE options API? @y-p
- plotting bugs
- scatter and grouped hist
- DONE wide frame repr
- PeriodIndex fixes
- groupby memory optimization
- DONE Resample API change !!!
- DONE centered moving window functions
- pivot annual hourly
- DONE Fillna API change
