v0.1.0

BranchAndBound v0.1.0

Closed issues:

• make public (#2)
• functions to create child nodes conveniently (#4)
• bug in isempty (#6)
• adjusting branch objects (#7)
• global primal and dual bounds in tree (#8)
• Relocating the rollback branch (#10)

Merged pull requests:

• code enhancement/bugfix and preps for public repo (#5) (@kibaekkim)
• A simple BnB method for local solution of MINLP (#9) (@kibaekkim)
• resolved #10 (#11) (@kibaekkim)