Fix example Makefile

It doesn't work on OS X as it is now.
Merge pull request #900 from rads/patch-1

Fix example Makefile
Eliminate useless var definitions.
Merge pull request #902 from akzhan/eliminate_useless_var_definitions

Eliminate useless var definitions.
Update README.md

add dependencies status badge.
More info on badges: https://github.com/olivierlacan/shields
Merge pull request #906 from gravis/patch-1

Update README.md
wtf coffeescript is not a dep
Release 0.28.2
Revert "Eliminate useless var definitions."

This reverts commit 22bcdae1b3618f4397a00febbbb3ee7085971520.
Update slim repo url
Merge pull request #911 from Nami-Doc/patch-1

Update slim repo url
Mention include file extension filters in readme

This is a useful thing to know, especially for embedded styles/scripts.
Merge pull request #913 from stuartpb/readme-mention-includefilter

Mention include file extension filters in readme
Don't lock coffee-script dev-dependency

We don't lock any of the other dev-dependencies
fix indentation issue

body should not be in head
Merge pull request #918 from Nami-Doc/patch-1

fix indentation issue
Merge remote-tracking branch 'upstream/master'