Vidmind - Nice upgrades

[amirlazarovich]

Better cache handling, flexible ImageLoader, inheritance friendlier classes, minor bugfixes.

Notes:

• We "disabled" the http retry mechanism (by simply setting its default value to "1") since it had no use for use but overhead. You might want to omit this change when pulling.
• One more thing is that we tried different approaches for image downloads (still not using connectionpool though) but rolled back to what it was at first place - so you might see changes there but without any actual use - so again, i would probably omit these changes as well until we have something solid.