Corrected node.js version requirement.

package.json was being told that nodebb only required version >=0.8.x of node. Per documentation and communication with developers this should be >=0.10.x
Changing this should help users who accidentally run nodebb on node.js 0.8 to run it on a supported version of 0.10.x or highter.
Merge pull request #1961 from RefinedSoftwareLLC/patch-4

Corrected node.js version requirement.
fix link to travis-ci build in README.md
Merge pull request #1997 from nchase/patch-1

fix link to travis-ci build in README.md
filter:category.get applies to all category-like API calls now

@a5mith
https://gist.github.com/psychobunny/572d867935469774c6e8#comment-1281883
fixing request to /api not returning api result
closes #1998
getMainPost uses getMainPosts
merge
added topic owner uid