use travis and coveralls

.travis.yml

@@ -0,0 +1,16 @@
+language: perl
+perl:
+  - 5.18
+  - 5.16
+  - 5.14
+  - 5.12
+  - 5.10
+  - 5.8
+install:
+  - cpanm -nq --installdeps .
+  - cpanm -nq Devel::Cover::Report::Coveralls
+script:
+   - PERL5OPT=-MDevel::Cover=-coverage,statement,branch,condition,path,subroutine prove -lrsv t
+   - cover
+after_success:
+  - cover -report coveralls