Applying changes agreed on 25/11/13 meeting

* modified entity names: contrast_standard_error_map_id and
residual_mean_sum_of_squares_map_id
* design matrix stored as csv instead of png
* contrast name also stored in contrast_id entity
Fix: png -> csv

Also renamed residual_mean_sum_of_squares_map_id entity to
niiri:residual_mean_squares_map_id
rebasing gllmflndn code and adding estoimation activity
Merge pull request #3 from cmaumet/gllcoderebasedwithactivity

Rebasing according to ni-/ni-dm and keep statistical_estimation activity
Merge pull request #11 from gllmflndn/master

enh: new entities