Support for uploading file with description

[carycheng]

No description provided.

[boxcla]

Hi @carycheng, thanks for the pull request. Before we can merge it, we need you to sign our Contributor License Agreement. You can do so electronically here: http://opensource.box.com/cla

Once you have signed, just add a comment to this pull request saying, "CLA signed". Thanks!

[coveralls]

Pull Request Test Coverage Report for Build 1844

• 10 of 10 (100.0%) changed or added relevant lines in 2 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.4%) to 62.008%

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Files with Coverage Reduction	New Missed Lines	%
src/main/java/com/box/sdk/BoxAPIRequest.java	2	64.64%
src/main/java/com/box/sdk/RealtimeServerConnection.java	3	80.0%

Totals
Change from base Build 1841:	0.4%
Covered Lines:	4965
Relevant Lines:	8007

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💛 - Coveralls