update readme
fix a few grammer and spelling errors
moar structural tweaks to the text
tweaks and fixes thanks to @Alint
fix url
add submodule init instructions
Merge pull request #69 from m8ttyB/readme

Readme
wrap lines at 80 characters
move virtualenv section
add a section discussing the --destructive flag
replace tabs with spaces
de-nerf output section
add a period
Merge pull request #71 from m8ttyB/readme

Add a section discussing --destructive