Update Readme and add .livereload to ignore list

  + replace fetch with retrieve
Update Component's content. It works with a work around.

  + a couple of bug in escidoc-ijc
Add precondition check and upgrade escidoc-ijc
add exception handling
remove comment
Set MIME type of component

  If the client provides a MIME type in her request, the update service uses it. Otherwise
  the update service set it to application/octet-stream
Add update component's content

  see README.md for usage
Add usage
Merge branch 'feature/blob-update' into develop
fix readme
merge with master