Build Boost as C++

• Added pure_c=False when build Boost packages
• Boost build all packages or STATIC or shared. Mixed packages will not be built
• Skip MT (runtime) when build Boost

Cutomize Bintray repository

Added environment variable BINTRAY_REPOSITORY to customize Bintray repository name.
By default, this name uses "conan-public" to solve Bincrafters' repository.

Add Circle CI support

Now we brought Circle CI to Bincrafters.

• Solve Circle CI env vars to collect username and repository name.

Fix option regex

Now its possible to use multline options

Solve custom remotes

• Add Bincrafters as remote when username is not bincrafters

Skip conan install

• Remove unused packages (requirements)

modular package

• build, test and deploy using Travis CI
• execute all unit test with pytest
• code coverage >90%