Update tests to ignore case in charset negotiation
Improve  message for invalid media type for seq
Fix conflicting versions of tools/macro

* compojure and midje depend on conflicting versions of
  org.clojure/tools.macro
String representation sets charset. fixes #12

If no accept-charset header was given and thus no charset
negotiation took place, the representation for a string
falls back to the first charset given in available-charsets.
Fix missing media type for example "hello-george". Closes #9
Rename merge-map-element to combine. Closes #11
Bump version of org.clojure/data.csv. Closes #14
Bump version for release 0.8.0
Bump version for development to 0.9.0-SNAPSHOT

* 0.7.0 has accidently been skipped. I'm sorry.
Travis: add oraclejdk7 to jdks to test with
Bump dependency version numbers

* Stable release for lein midje
* Use new hiccup to prepare using codox for api documentation
  generation
Add can-put-to-missing? as a decision point

* Return not-implemented (501) if put-to-missing? evaluates to false