Fix invalid number format in cache parse

Play store crash report listed a couple of crashes related to number
format exception when parsing the cache file. Apparently it had binary
content.

Stack trace:

java.lang.NumberFormatException: unable to parse '. dFb�D�DFb�Du'.. dFb�D�DFb�Ds'CORE �b�D�D�b�Dv'' as integer
  at java.lang.Integer.parse(Integer.java:383)
  at java.lang.Integer.parseInt(Integer.java:372)
  at java.lang.Integer.parseInt(Integer.java:332)
  at org.helllabs.android.xmp.util.InfoCache.boolean checkIfCacheValid(java.io.File,java.io.File,org.helllabs.android.xmp.util.ModInfo)(MyApplication:77)

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Update changelog

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Remove unused resources

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>