presto: rename makefile cm.mk to ev.mk
presto: switch Evervolv prebuilt boot animation
presto: disable QCOM Variants.

This variant are included in dependencies
presto: README: Update branch to lollipop
presto: recovery init move to msm8x60-common
presto: Add TWRP Recovery.

Adapt from this commits:
 - https://github.com/marduk191/android_device_pantech_presto/commit/ef391adbf7a44f32c81b153d2ed6309a713c6824
presto: select evervolv_presto_defconfig
presto: use 4.7 gcc for the kernel
presto: board-bcm: use android 5.0 style