Merge branch 'release-0.2.2' into develop
Added Homebrew formula.
Remove compiler warnings about unused variables in ragel-generated code.
Change dr::Reader to take a const Schema instead of a non-const Schema.
Allow dr::Slice<T> to be iterated through using a C++11 foreach loop.
Renamed docrep decorator template parameters to give a better indication
of what they're used for.
Added docrep sequence tagging functors.
Added pkg-config brew dependency.
Added initial ideas for feature generation API.
Removed accidental inclusion of _impl header files.
Use safe_open_[io]fstream functions everywhere.
Expose OpHelp and OpVersion from config::Main.
Manually detect --help and --version in dr dispatch.
Correected missing namespace qualifier from macro definition.
Added missing definition of Instance<TRANSFORM>::dump_crfsuite.
Initial work on unicode data extraction.
Removed old scripts.
Added initial unicode framework and UTF-8 decoding.
Updated Unicode database extraction to write directly to C++ files.
Added initial cut of unicode ctype and database files and tests. Tests
for to_(lower|title|upper) are still to come.