Patch release

• v1.2.1: allow R only from main thread
• Fixed type branching bug
• Fixed socket type for Windows

factor conversion to symbol

Merge pull request #2 from sv/master

fix factor conversion

simplify working with interactive plots

• run an internal thread to process event loop
• lower requirement for glibc to run on older Linux distributions
• ropen returns mode of operation and rclose does nothing now

Initial release as a separate repo

v1.0.0

update push key for travis