Dist related improvements.

 - Corrected author in Makefile.PL
 - Added Test::Deep which is needed for some tests as build-time dep.
 - Removed META.yml as it is auto-generated at make dist stage.
 - Removed INSTALL.html because it is generated at build time.
 - Modified .gitignore so it ignores build-generated files.
Merge pull request #3 from mbeijen/make-improvements

Dist related improvements.