v1.1.2: CRAN package

CRAN version 1.1.2 (#118)

* fix review comments on R package

* update R interface in volume and sample_points

* update Rcpp modules and S4 classes

* replace modules with R classes

* update R documentation

* fix R tests

* fix R bugs

* add hpoly new generator, fix bugs in rounding with biw

* update the Rd files

* fix c++ tests and a bug in volume.coo

* fix c++ test

* update polytope random generators in R, update rd files

* fix bugs in R interface

* seperate sdp functions