title: Python Camelot borderless table extraction issue
body: <p>I'm trying hard to extract some borderless table as show in the below image which are from pdf files. I have installed python-camelot as shown <a href="https://github.com/socialcopsdev/camelot" rel="noreferrer">here</a> and is working fine for bordered tables only. Please find below details:</p>
  
  <p>platform - Linux-4.5.5-300.fc24.x86_64-x86_64-with-fedora-24-Twenty_Four</p>
  
  <p>sys - Python 3.6.1 (default, May 15 2017, 11:42:04)[GCC 6.3.1 20161221 (Red Hat 6.3.1-1)]</p>
  
  <p>numpy - NumPy 1.15.4</p>
  
  <p>cv2 - OpenCV 3.4.3</p>
  
  <p>camelot - Camelot 0.3.2<img src="https://i.stack.imgur.com/bzL0L.png" alt="enter image description here"></p>