core: add .travis.yml
core: add Travis build status to README.asciidoc .
core: merge "mkdir build" & cd build in .travis.yml

to "mkdir build;cd build"
core: .travis.yml: remove ulimit & -DCMAKE_BUILD_TYPE=Debug.
core: .travis.yml: remove debug & ulimit && run weechat
core: README.asciidoc: move build status under homepage link.
core: .travis.yml: install build-depedencies as said in debian/control.
core: .travis.yml: install devscripts to get mk-build-deps / fix build.
core: .travis.yml: install equivs

which is required by previous mk-build-deps which comes from devscripts and
 which should depend on equivs, but it doesn't...
Merge pull request #69 from Mkaysi/travis

Travis