Added app search endpoint.

When polling the app list HTTP endpoint, you can now search the app list by
'id' or 'cmd' using the HTTP URL query format, like so:

  http://marathon-host:5500/v1/apps/search?id=some-app
Merge pull request #58 from brndnmtthws/app-list-filter

Added 'id' and 'cmd' query praams for app list.
Update README to clarify launching, point to Mesosphere downloads. Fixes #51
Adding task killing
Finish  /v1/tasks
Merge pull request #59 from mesosphere/tasks-update

Add /v1/tasks to list tasks, and kill them per app and host
[maven-release-plugin] prepare release marathon-0.1.1
[maven-release-plugin] prepare for next development iteration
Adding hostname constraints
Adding LIKE constraint
Adding LIKE constraint
Merge branch 'hostname_constraints' of github.com:mesosphere/marathon into hostname_constraints
Merge pull request #60 from mesosphere/hostname_constraints

Adding hostname constraints
Point Mesos links to new URL

https://mesos.apache.org/
Point projects to SSL and cut redirects
Upgrade to Chaos 0.4.7
Disallow problematic characters in app ids. Fixes #46