New version v0.2
Merge branch 'housekeeping'
New Object constructors

Object has new constructors accepting all integer, floating point, string
and boolean types. The new cf_metaprogramming.h header provides
metaprogramming utilities such as enable_if, is_integer, etc...
Merge branch 'simone'
Merge branch 'master' of github.com:simone-campagna/Configment
New implementation of Object constructors

The new implementation of the Object constructors does not require
the second dummy parameter to allow enable_if. Unfortunately, this
requires the implementation of is_base_of.