set_relativePosition shall use the target view frame

Signed-off-by: Marc Lefrançois <mlefrancois@mirego.com>
correct casing in method name

Signed-off-by: Marc Lefrançois <mlefrancois@mirego.com>
Merge pull request #7 from marclefrancois/master

Fix setRelativePosition , it must use the targetView Frame