Testing for Acme Alien dists

[plicease]

These commits:

1. Adds a pkg-config style dontpanic.pc file so that libdontpanic can be installed as a system lib and detected as such by Alien::Base and Acme-Alien-DontPanic
2. Adds a .travis.yml for testing each push
3. Adds a .gitignore
4. numerous small fixes to get these things working

Note that ALIEN_FORCE=1 testing is broken because Alien::Base in CPAN will not install with that environment variable. As soon as we get that fix into CPAN, these tests should start passing.

[zmughal]

Merge: Aye

[plicease]

Me toos: Aye

[jberger]

Most of this looks fine, why the new gen-dontpanic.sh and if its useful why not remove the gen-dontpanic.pl? Otherwise, aye

[plicease]

I had trouble getting the Perl version to work. Also I think it is better to let the autotools create the tarball (I think?) since it will use a standard process. I didn't remove the old version because I wasn't feeling especially aggressive in terms of throwing stuff out, but we can remove it.

[plicease]

I also enabled travis for this repo