add shortcut method when we have no edge inset to specify

Signed-off-by: Marc Lefrançois <mlefrancois@mirego.com>
add shortCut for UIEdgeInsetZero

Signed-off-by: Marc Lefrançois <mlefrancois@mirego.com>
update version in podspec

Signed-off-by: Marc Lefrançois <mlefrancois@mirego.com>
wrong method signature

Signed-off-by: Marc Lefrançois <mlefrancois@mirego.com>
Merge pull request #6 from marclefrancois/master

Clearing naming of the "relative position flavored methods" + add some tests and cleanup