v0.4.6.160304 Bugfixes Android6 Media Scanner

• Added Image-View menu "Show in new Gallery": opens a new Gallery-View that is prefiltered by the image view sort/filter context. If the Image-View has been opend from an external app before the sort/filter context is the current folder of the image.
• Fixed #22 Update "Show in map" menu for Image-View is only visible if current image has geo infos.
• Fixed #33 Android-6 Media Scanner Fixes eleminate npe and duplicate db entries because auf dir-symlinks. Only non-smylink-images are strored in DB
• Fixed added support to INTENT-ACTION-VIEW with "content:" uri if mime is image
• Upgrade lib osmdroid-android from 4.3 to 5.1