compression support for additional MIME-types

added the following MIME-types gzipped
  - application/javascript
  - application/json
  - text/css
  - text/plain
Merge pull request #1 from bchang/48ba4a4eef48b7480571345b155beb2c84bf27cc

more compression!
location includes allowed
include correctly
Merge remote-tracking branch 'github/master'