bump up to 0.99 beta 1
@vhuber: simplify code by using `geo()`
various cmake updates:
 - up #411 set MACOS_RPATH by default and remove warning
 - fix #420 find mkl
 - fix #421 ML has its own FindML.cmake file now. find ML first before PETSc then after
   once PETSC_DIR is defined in case ML was not found initially and PETSc has
   installed its own version
fix #420 added MKL support
 - added mkl_pardiso to the list of support direct solver (not parallel)
update
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
up #420 : enable MKL in eigen3
see http://eigen.tuxfamily.org/dox-devel/TopicUsingIntelMKL.html
up #420 enable mkl in eigen3
in version 10 the domain name was MKL_BLAS while in 11 it is MKL_DOMAIN_BLAS
hence the need to provide the trick -DMKL_BLAS=MKL_DOMAIN_BLAS to ensure
compilation of eigen3 code using MKL11