Clean up grammar in docs.
Clean up grammar in docs.

The docs were missing words and had some weird capitalization issues
that have mostly been corrected.

Additionally, pip was placed before easy_install in docs to encourage
newbies to use pip instead.

mitsuhiko/flask-oauth,EricSchles/flask-oauth,ligthyear/flask-oauth,EricSchles/flask-oauth,mitsuhiko/flask-oauth,ligthyear/flask-oauth,lwinters-cs470/Flask-OAuth,lwinters-cs470/Flask-OAuth