Temp install path should be changeable

[camalot]

Original Bug on CodePlex

  public const string TEMP_DIRECTORY_FOR_INSTALL = "/mnt/sdcard/tmp/";

This path may not exist, and may not be able to be created. Need to allow for this path to be configured / or passed in as an option when installing.

[pushasha]

Not sure if this is related (or if I should open a separate issue), but when I use the InstallPackage method, it seems to resolve the temp directory in an odd (and incorrect) way: Unable to chmod /storage/storage/emulated/legacy/tmp/testapp.apk: No such file or directory

Forking the project and forcibly removing the duplicate /storage/ from the beginning fixes the issue, but I haven't had time to dig deeper to figure out where it's coming from.