fixed bug and added error handling when there are NAs in timestamp

[terrytangyuan]

Currently, if there's NA in timestamp, R will give the following error:

Error in if (gran >= 86400) { : missing value where TRUE/FALSE needed

However, it is too hard for the user to know what the problem is, at least for me, I don't know where to fix the problem. I think this error handling is needed so that user knows where to go from here.

[terrytangyuan]

See this issue #28 I didn't notice someone else had this issue. It took the users a while to figure out the problem. They'll have to dig into the code to see how to fix it.

[akejariwal]

@caniszczyk I approve this PR. Please merge.

[terrytangyuan]

Could you merge this as well? Thanks.

[terrytangyuan]

Thanks Chris.
On Aug 31, 2015 4:11 PM, "Chris Aniszczyk" notifications@github.com wrote:

Merged #51 #51.

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