GUI. Finished add prescription
GUI. Add new prescription. Table of doses
GUI. Update prescription part 1
GUI. Applicattion skin changed to brown
GUI.

Icons and launch image updated.
Now appears a Dose text.
BUG. Added a sample prescription when prescription list is empty
BUG. Fixed one bug related with last dose calculation
Removed a warning message
Selection from image library working fine
Image stored in base64
Rebladed NSString in base64 by NSData
Several issues

Save button when image is updated
Move image from update screen to main prescription list
Add picture button when is being added a prescription
Merge branch 'Camera-integration'
Merged. Camera integration branch