Remove inlineAndCompileSync and its use,  require.js.

The sync compile was only used for two test files.
These tests are now compiled explicitly in the Makefile.
The .traceur.js pattern for triggering compilation now is .generated.js;
the source files are in test/unit/es6.

TBR=johnjbarton

Review URL: https://github.com/google/traceur-compiler/pull/604

Closes #604.