Adds accessors for the wrapped attributes and provide preliminary support for type deduction to ADAPT_ASSOC* macros.
Adds the possibility to omit the member type in ADAPT_ASSOC* macros usage.

This feature is enabled when BOOST_PP_VARIADICS also is, as it rely on it.
A placeholder for the type can be used when BOOST_PP_VARIADICS isn't
active.
Test adapt_assoc_tpl_struct checking support for type deduction.
Adapted tests of assoc_struct to the type-deducing version of the ADAPT* macros.
Renamed macro wrapping attribute to a more descriptive name.
Adapted test cases for adapt_assoc_tpl_struct with type deduction.
Documented BOOST_FUSION_ADAT_ASSOC* macros with type inference.
Add missing include.
Fix the DEFINE_ASSOC_STRUCT macros to use specific FILLER macros, because they cannot need type deduction.
Merge pull request #13 from daminetreg/fusion_adapters

BOOST_FUSION_ADAPT_ASSOC_STRUCT* deducing types