Bump NPM version to 0.4.10 in preparation for publishing.
Guarantee unique temporary variable names.

Closes #11.
Closes #22.
Require recast v0.6.5 (for ast-types v0.4.7).
Bump NPM version to 0.4.11 in preparation for publishing.
Reenable node v0.6 tests (no longer allow failures).
Make bin/regenerator read from STDIN when no file name given.

Closes #125.
Bump NPM version to 0.4.12 in preparation for publishing.
Add runtime support for async functions.
Transform async functions and await expressions.

Closes #100.
Add async function test harness, with Promise runtime polyfill.
Add very basic tests of async functions and await expressions.
Add a test of awaiting dependent promises out of order.
For async functions, pass null as the outerFn argument to wrapGenerator.

If providing a reference to the outer function became necessary for async
functions, to really get it right we'd have to transform each async
function declaration into a named function expression assigned to a
variable of the same name, hoisted to the top of the enclosing block,
analogous to the treatment of generator function declarations introduced
by b9e64e121ebf5a5f74efdd7b60b4d4e23f20b1cc.