javadoc, opacity

the first part of the opacity implementation.
is currently bound to the progress-updates.
Some 'old' javadoc.
full implementation of the opacity thing

now fully integrated in the example app. Works quite well. But the
example application, looks kinda messy now.  need to find a fix for that
soon. Added more Javadoc and fixed some warnings.
eclipse preferences

to avoid build errors
new grayscale possibility

adds the possibility to turn the image into b/w with a simple command.
Not sure if this is useful to anyone, but you can do it :D.
new example application

with navigation drawer. More or less okay, needs some bugfixing.
clean up

clean up
bugfix

to save the last selected position
version up

version up, ready for play store =)
Merge pull request #10 from mrwonderman/version_1_2_0

new version 1.2.0