task_group: minor test change.
Build system: simplify identification of 128bit integers for GCC.
piranha.hpp: drop TODO item.
t_subs_series: work in progress for the sfinae-ing of methods.
Merge branch 'master' of gitorious.org:piranhapp0x/mainline
t_subs_series: some more doc and tests.
power_series: simplify macro usage.
series: minor change in the use of declval for evaluation types.
math: a couple of minor changes in the has_t_subs type trait.
math: implement has_subs type trait.
math: more tests for the subs type trait.
t_subs_series: another simplification in type deduction.
integer: some simplification in the implementation of the binomial math overload.