fix iOS 7- drawLabels error

The function
	- (void)drawInRect:(CGRect)rect withAttributes:(NSDictionary *)attrs
available only after iOS 7
Add bounds check for circle so that touches are only registered if it falls within circle, not the view's frame rectangle.
fix label position (wrong after Tom Redman merge) and add lableDisplacement property
add big line example with label alignment reference
Merge branches 'fix_label_position', 'fix_line_position', 'add_test_view_controller' and 'fix_drawInRect_error' into dev

Conflicts:
	EFCircularSlider/EFCircularSlider.m
Merge branch 'master' of github.com:fatuhoku/EFCircularSlider into fatuhoku-master
Merge branch 'add_test_view_controller' of github.com:ciotto/EFCircularSlider into ciotto-add_test_view_controller
Merge pull request #17 from ciotto/fix_line_position

fix line position dynamically
Merged fix label position
merged fix label position
giving attribution for design inspiration
Merge branch 'master' into dev
fix for small line