Compile only constants and use FFI to dynamically link
Move Calendar spec out of ICU module
Function to turn a UEnumerator into an Enumerable
Use codepoint rather than binary in expectation

The default source encoding varies between Ruby versions. If it changes
again, we need to be more explicit.
Test against multiple versions of ICU in Travis
Use HTTP for now

http://sourceforge.net/p/icu/mailman/message/32183191/
Install ICU headers to a local directory
Only build necessary parts of ICU
Handle recent timezone data

Europe/Busingen was added in 2013a.
The spec task no longer compiles
Default timezone
Function to provide an ErrorCode and assert it contains success
Return the block result when creating a temporary UChar buffer
Use Library.assert_success where reasonable
Move return statement to the block in which it is required
Vim word list for specs
Calendar instance
Describe assigning a nil timezone
Move conditional into method
Set the time of an instance