Android-MuPDF in android studio

this is mupdf project forked from https://github.com/joniks/Android-MuPDF

convert it to project under android studio.

add a simple pdf reader activity, to show basic useage.

Copied from https://github.com/joniks/Android-MuPDF MuPDF usage for magazine reading.

MuPDF developer team: http://mupdf.com/

Original source repository: http://git.ghostscript.com/?p=mupdf.git;a=summary

Native libs compiled from original source commit: http://git.ghostscript.com/?p=mupdf.git;a=tree;h=a0a9ce485579352ce9c3c4568c07e56b7029a8c8;hb=a0a9ce485579352ce9c3c4568c07e56b7029a8c8