v1.7.1

Highlights:

• Update SDL for keyboard repeat bug fix on Linux
• Doc fixes

Changes between v1.7.0 and v1.7.1:
a2084df document that particles2d requires a blend mode
c0ef4d2 fix typo in docs
2b7c39e call finishTransaction on iap transaction
3d6977c iap changes
52cfd10 improvements to iaps
b6accfd add am.get_banner_ad_height
3619b47 towards android port
ea5b3b2 android java wrapper
44d1211 android: fix bug when restarting after gl context lost
fb7ecb7 add SDL2-hg-2016-10-30 for keyboard repat fix
43e0fdf add prebuilt sdl for linux64
0bfc9bf add prebuilt sdl for linux32
d72a111 add sdl win patch file