Fix pkgdown build

Fix CRAN Solaris issue of pow overloading (#19)

* Fix overload error in pow given by:

error: call of overloaded ‘pow(int, unsigned int&)’ is ambiguous

By switching over to static_cast's to double.

* Add CRAN badges now that it is listed on CRAN.

* Bump package version and update submission remarks...

Address CRAN Feedback 3/20 (#17)

* Remove don't test and drop to 1 observation

* Update CRAN comments