add BasisFunctions class
not used yet
update #279 :
 - move classes in expr.hpp into their own headers
 - document some of the functions
ignore some files
add a version of thermalblock using operators free
update #158
 - now lambda expression support up to 3 arguments, more is easy to do thanks to
 variadic templates
 - updated test_lambda.cpp
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
update #279:
 - fix compilation after dispatch
up #158
 - fix compilation
use jekyll for doc
increase timeout
fix and clean
close #352
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
up #158:
 - fix test_integration where components expression conflicts with lambda expression
not finished
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
not finished
fix use of operators free for elliptic linear models
take into account signs associated with dofs in curl operator (needed for hdiv, hcurl : #251, #252)
use direclty msh instead of geo to avoid orientation issues