Styling for categories #27
Update README
Fix tab indentation
Small fixes to documentation
improve category documentation

I think this should explain this more easily for newcomers.
integrate external PNGs into the CSS
make tree icons independant of pathinfo feature

icons for files and directories in the tree view should work regardsless
of the gitweb config option

```perl
$feature{'pathinfo'}{'default'} = [1];
```
Merge pull request #28 from klaernie/improveDoc

improve category documentation
Merge pull request #29 from klaernie/inline_pngs

integrate external PNGs into the CSS
Merge pull request #30 from klaernie/universal-tree-icons

make tree icons independant of pathinfo feature
Use sane default arguments for ln
Merge pull request #31 from avsej/master

Use sane default arguments for ln
Fixed highlighting maked parts in diff
Merge pull request #32 from igoryok-zp/diff_marked_fix

Fixed highlighting maked parts in diff
Fixed displaying change timezone popup
Merge pull request #33 from igoryok-zp/popup_timezone_fix

Fixed displaying change timezone popup
Merge pull request #1 from kogakure/master

update all commits