Refill return code check
Shift tests
Added status messages to tests
Moved to Qt Creator IDE
Moved again to ST2, lol
UTF-16 surrogate fixes

Major:
1. UTF-16 surrogate fixes:
   * Proper buffer limiting
   * Surrogate-aware context_refill()
2. Implemented context_shift()
3. Implemented lol-garbage-collecting allocation in tests.
4. Fixed the test_fetch_shift() due to surrogates.
5. Fixed some warnings & valgrind complaints.
6. Some changes in the renamed test_common.* that I've forgotten about
   and stupid Git cannot see them.

Minor:
1. Fixed tabs and spaces in Makefile
2. Removed Sublime stuff from VCS
3. Some renamings.
Enabled all tests. Fixed failing assert
Removed dead code
Reimplemented simple cases: empty strings, some comments
Implemented a new invariant for the context->current pointer
[failing assertions] Transferred multiline comment support
Surrogate tests + more assertions