implement JSON API backed ExternalMediaVariable
handle Requested media not found
return self in reload
return self in reload
Merge pull request #1 from screenconcept/features/media_variables

implement JSON API backed ExternalMediaVariable
add fileType to ExternalMediaVariable
disable savon sdtout request logging
support variables with multiple elements
make variable value splitting nil value prone
return last entry of media variable list
prepare v0.1.0