OS merges

Summary:
All pretty trivial:

#99
#98
#45

Test Plan: Will watch jenkins fbthrift build

Reviewed By: dcsommer@fb.com

Subscribers: doug, njormrod, folly-diffs@

FB internal diff: D1669952

Signature: t1:1669952:1415643677:906234f0a89f38645b0072d3c88762d8fa2729dc

README

@@ -42,7 +42,8 @@ sudo apt-get install \
     make \
     zlib1g-dev \
     binutils-dev \
-    libjemalloc-dev
+    libjemalloc-dev \
+    libssl-dev
 
 Ubuntu 14.04 LTS
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