GPII-153, GPII-187: Started textfieldStepper

Beginning of refactoring of textfieldStepper. Unit tests are not yet passing.
Merge remote-tracking branch 'cindy/GPII-153_GPII-187' into GPII-153_GPII-187

Conflicts:
	src/shared/adjusters/html/increaseSizeTemplate.html
GPII-153, GPII-187: fixed textfieldStepper guard

Fixed the textfieldStepper guard to handle parse string values inputed from the textfield. Also fixed up the unit tests, all are passing now.
Merge remote-tracking branch 'origin/GPII-153_GPII-187' into GPII-153_GPII-187