fixes #41 resetting samples popup on change

When a new algorithm is chosen in the samples popup UI, then
config elements are resetted (nr of samples field, button, etc.)
fixes #42 [no, not everything :)]

fixes a problem with the size representative generator
that caused a fewer elements to be returned in situations
where more should have been returned.

fixes a problem where selecting 1 element always returns 2.
updating c3po xsd schema

updating c3po schema
removing old unnecessary files
release 0.3.0

adds a more verbose output on errors during parsing
improves spinner ui upon error and succes events
fixes a bug with the caching of an existing profile (with/without filter
condition)
adds Travis support (experimental)
adds changelog (+ script)
fixes a bug during FITS parsing, caused by ambiguities in the FITS
output
adds an experimental TIKA adaptor (only limited properties are supported)
fixes a bug in the Samples UI
fixes a bug in the Size'o'Matic 3000 algorithm