[PATCH] cpp11-migrate: Add command line option to enables transforms automatically

[Guillaume Papin]

Hi revane, arielbernal, tareqsiraj,

cpp11-migrate: Add command line option to enables transforms automatically.

It is now possible to states what compilers we wants to support on the command
line, the tranform will be selected automatically.

The new option is `-toward` by I'm open to suggestion for the name (`-to`,
`-targets`, `-P` for platform, ...):

As stated in the documentation the usage is like this (to migrate toward Clang
>= 3.2 and GCC >= 4.7):

  cpp11-migrate -toward clang-3.2 -toward gcc-4.7 <args...>

http://llvm-reviews.chandlerc.com/D1154

Files:
  cpp11-migrate/AddOverride/AddOverride.cpp
  cpp11-migrate/AddOverride/AddOverride.h
  cpp11-migrate/Core/Transforms.cpp
  cpp11-migrate/Core/Transforms.h
  cpp11-migrate/tool/Cpp11Migrate.cpp
  docs/MigratorUsage.rst
  test/cpp11-migrate/Combined/compilers.cpp
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