Fix issues 200, 201 Also, * Fix link to bigtable paper in docs. * New sstables will have the file extension .ldb. .sst files will continue to be recognized. * When building for iOS, use xcrun to execute the compiler. This may affect issue 177.
Non-functional changes only: 1) Add Kevin Regan to the AUTHORS file 2) Add standard license header to issues/issue178_test.cc
Fixes issues 161 174 178 As well as the issue reported by edouarda14@gmail.com about MissingSSTFile unit test failing on windows.