Add link to API for "data-manual"

A link to the API section is helpful for those who need to use the "data-manual" or other features that are not included in "Basic usage" since the API section is located on the "Extending Prism" page.
Add tomorrow night 80's syntax theme
Add Python syntax highlighters
Update code.js, small improvements to prism-python.js & prism-python.min.js, revert prism.js to original
small correction to code.js
add SQL syntax highlighters, update code.js, cut 2 bytes from python.min.js
Fixes some Sass issues
Close #73, close #79
Merge pull request #80 from MoOx/sass-fixes-73-79

Fixes Sass issues #73 & #79
fixed URLs in strings.
Merge pull request #81 from ngryman/gh-pages

Fixes URLs in strings
Merge pull request #60 from davidl/patch-1

Add link to API at end of "Basic usage" section
Merge remote-tracking branch 'origin/gh-pages' into gh-pages

Conflicts:
	code.js
Merging with original branch changes
Merge pull request #71 from multipetros/gh-pages

Add Python & SQL syntax highlighters
Merge pull request #70 from R-osey/tomorrow-night

Add tomorrow night 80's syntax theme
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages

Conflicts:
	code.js