Use Travis-CI for testing with libpsl
Use Travis-CI for testing with libpsl

* .travis.yml: Add file

When hooked to Travis-CI, public_suffix_list.dat and tests/test_psl.txt
will be tested using https://github.com/rockdaboot/libpsl.
The tests includes testing with libicu (IDNA2008 UTS#46),
libidn2 (IDNA2008) and libidn (IDNA2003).

pantheon-systems/list,plinehan/list,elnappo/list,SimonKissel/list,dead10ck/list,publicsuffix/list,publicsuffix/list,SimonKissel/list,sleevi/list,dead10ck/list,Drooids/list,sleevi/list,pantheon-systems/list,SimonKissel/list,plinehan/list,publicsuffix/list,elnappo/list,plinehan/list,Drooids/list,rockdaboot/list,sleevi/list,rockdaboot/list,rockdaboot/list,rockdaboot/list,sleevi/list,elnappo/list,publicsuffix/list