Updated .travis.yml
Bumped version to 2.0.1.
Check if EC2m is available before using it

Some openssl packages do not include EC2m due to patent concerns, but
support elliptic curves, so rubysl-openssl do not build on those
systems.

This checks if EC2m is avilable (or rather, not disabled).
Merge pull request #1 from henrikhodne/ec2m-check

Check if EC2m is available before using it
Bumped version to 2.0.2.
Merge remote-tracking branch 'parent/2.0' into 2.0