README.android

Code obtained from
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https://re2.googlecode.com/files/re2-20130115.tgz

Version
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re2-20130115.tgz

Changes required to build using stlport on Android as follows (full diff)
-------------------------------------------------------------------------
util/util.h:

44,53c44
< #if defined(ANDROID)
< 
< #if defined(_STLPORT_VERSION)
< #include <unordered_set>      // using stlport
< #else
< #include <tr1/unordered_set>  // using gnustl
< #endif
< using std::tr1::unordered_set;
<  
< #elif defined(__GNUC__) && !defined(USE_CXX0X)
---
> #if defined(__GNUC__) && !defined(USE_CXX0X)