scala 2.10.0-RC5 support

- bumped version to 0.3.3
- removed support for scala 2.9.1 and 2.8.x
bumped to 0.3.4 for scala 2.10.0 final
removed commons-codec dependency

bumped version to 0.3.5
Fix for readString bug in scala 2.10.0
response headers now Map[String, List[String]]

since there can be multiple values for the same key.

thanks @aagahi
bump to 0.3.6
proxy support
0.3.7 release
Fixed typo in example code.
Merge pull request #16 from AntonFagerberg/master

Fixed a typo in the example code in the readme.
Move asXml/asParams/asParamMap/asToken to be Http.read methods

Enables req.asHeadersAndParse(Http.readParamMap), so that the asParamMap
functionality is available when requesting code/headers.
Merge pull request #22 from pfhayes/dev

Move asXml/asParams/asParamMap/asToken to be Http.read methods
test against google
bumped version to 0.3.8
only need one 2.10 version
travis ci
triggering a build