Release 0.5.6

Releasing 0.5.5

Releasing 0.5.4

Release 0.5.3

Release 0.5.2

Fixes xd009642#46 by having tarpaulin return -1 in instances were tests can't be compiled.

Releasing 0.5.1

Release 0.5.0.

Update install script and Cargo manifest.

Merge branch 'master' of https://github.com/xd009642/tarpaulin

Merge branch 'thread_support' fixes xd009642#21

Release 0.4.0