Prepare for v0.3.2 release

Prepare for v0.3.1 release

Prepare for v0.3.0 release

Prepare for v0.2.4 release

Prepare for v0.2.3 release

v0.2.2 release

Add minified CSS to 0.2.1 files, update CONTRIBUTING.md for future re…

…leases

cc @DmitrySharabin

Release v0.2.0

Re-use objects created by getData(): 50% speedup in expression evalua…

…tion

Prepare for 0.1.5 release