Grammar fix in README.md
Fixed some typos and grammar.

Some typos where found by aspell: `aspell -l en_US check README.md`
Merge pull request #3 from badboy/typos

Fixed some typos and grammar.
Merge pull request #4 from paisleyrob/master

Grammar fix in README.md
Merge pull request #5 from rubicks/master

merge into macosx from master