Use assets plugin to minify CSS

Fix #67
Move out Pygments CSS code from elegant.css This way user can change the code hilight theme easily

He will just have to replace a file. As for speed, he can use assets
plugin to minify it.

Fix #67
Move tipuesearch css code to the default file. This will make it easier to upgrade tipue search

Fix #67
Remove variable for custom CSS. If user needs speed then he should use assets plugin

Fix #67
Revert "Remove tipuesearch.js from repository"

This reverts commit d60b1e7bf5e26855a8a5ec4e8bae3676583fcb6a.

Update #67
Use assets to minify tipue search code

Fix #67