Implemented Xliff support#5

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smottt wants to merge 12 commits intoservergrove:masterfrom

Commits on Feb 11, 2012

added --pretty-print option for formatted xml output
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Commits on Apr 1, 2013

Proper escaping
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Commits on Apr 13, 2013

Typo fixed
smottt
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Commits on Nov 15, 2014

Use the new \MongoClient class
smottt
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Commits on Jul 2, 2015

symfony 3.0 compatibility
smottt
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Commits on Dec 6, 2015

search translation collections by locale name
smottt
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