elseif is supported and braces aren't required for else...if statements
Update unsupported features
Highlight authors and contributors better. Make sure what was on the front page on php.net is referenced correctly in the Preface

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Give more information on the origin of this manual

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Merge pull request #142 from ClaudiuC/more_unsupported

Update unsupported features
Merge pull request #130 from ClaudiuC/elseif

elseif is supported and braces aren't required for else...if statements
Give XHProf a bit of love, particuarly on how to install on HHVM

Fixes #146
Add more detail around the use of top-level code in Hack

Fixes #145
Mark concrete collection classes as "Final"

Fixes #144
Enhance discussion on how .hhconfig is found and used by hh_client

Fixes #140
Type annotation table was too wide. Broke out into 3 tables.

Fixes #138
Add licensing information for contributions

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Fix the class member usage table

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Set in the language ref mistakenly mentioned it was unordered collection.

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Grammar fixes in collections hack language ref

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Had the wrong signature for Set|ImmSet::fromArrays

Fixes #160
Try to clarify collections a bit more, particulary around them being objects.

Fixes #157
Map::map and Map::mapWithKey need to return Tk, Tu (not Tk, Tv)
Shapes Generics exmaples needs to have string keys instead of ints

Fixes #153
async should have been await in the chart. (Note this also is fixing trailing whitespace issues too)

Fixes #151