v2.0.0

Includes, but is not limited to, these updates:

• Make it possibly to choose target api level with --api-level arg
• Check for underaligned TLS segments in program header
• (partially) re-brand to just elf-cleaner
• Add configure script, instead of just a Makefile
• Add some tests to check so that the tool do, and continue to do, what we want it to do