removed clj-http fixed dependency;

removed fixed clj-http dependency to remove collisions with newest
versions;

added travis.yml;
added com.cemerick/url as replacement for clj-http utils used before;
update README with travis badge;
fixed travis badge;
removed testing against multiple jvms;
fixed travis,yml - missed language;
removed cemerick.url to minify dependencies;
restored readme formatting; restored original version;
Merge pull request #17 from timgluz/update_deps

Removed fixed clj-http dependency and added travis.yml