redo tab functionality using ViewPager

PS2: added libs and adjusted android.mk accordingly (hopefully the right way?)
PS3: fixed compile error and NPE at startup
PS4: fix update check button
PS5: ok now it's fixed!
PS6: remove startup dialog in slimsizer (for now)
Ps7: remove whitespaces and tabs
PS8: once more...
PS9: kufi's really picky today! ;P

Change-Id: I4f27abd755d197cee098594605bee4d7931484c7
Merge "redo tab functionality using ViewPager" into jb4.2