Add missing context.cpp file.
Various spelling and grammar fixes in README.rst

Tidied up a lot of sentences to make them more clear. Fixed a few
spelling mistakes.
Merge pull request #2 from thethomaseffect/master

Fixed a few spelling and grammar mistakes in README.rst
Set correctly a format on page capture.
Add initial implementation of webelementcollection.
Add methods for find all elements on frame and webelement.
Clean some parts of webelement c++ api.
Initial work on global settings.
Now exposed some cache related config on cache object.
Clean some private api methods.
Improved dom searching and now can find webelement children elements.
Add some new methods to webelement python api.
Add docs structure and add minor introduction and small part of C api documentation.
Improved memory management with char pointers returned by c library.
Expose a lot of dom api as c library.
Add new c library dom api to ctypes definition.
Expose a lot of new dom manipulation api to python bindings.
Add docstrings to WebElement class on python bindings.
Add install documentation.
Change README.