Improvements of MarkerView (possibly fixed issue #76).
YLabelPosition can now be set to LEFT_INSIDE and RIGHT_INSIDE, XLabelPosition can now be set to BOTTOM_INSIDE and TOP_INSIDE (issue #69).
README updated

code fragments improved
fitScreen method description added
Merge pull request #91 from romangromov/master

README updated
Update README.md
Update README.md
Update README.md
test
Merge remote-tracking branch 'upstream/master'