Added `post get` command.
Removed the <filename> argument from `post get`.
Added the `--feature` option for `post get`.
Removed CSV format from `post get`, with JSON format it is redundent, etc.
Removed the `post_content` field from the table format output as the table becomes unweildy and the extremely long value of the content or the content itself causes problems with the table processing. Besides, chances are if one wanted the contents and the other fields JSON would be easier anyway.
Refactored the poorly named `compareJson()` function into the more accurate `checkThatJsonStringContainsJsonString()` function which encapsulates the calls to `json_decode()`.
Merge pull request #378 from j3lamp/master

`post get` command