On a local test site running Moodle 2.6dev (Build: 20130614).
After removing "old" survey module, install Survey(2) module latest module->version = 2013062805 from git://github.com/kordan/moodle-mod_survey.git.
Debug mode: DEVELOPER.
Installing Survey is a HUGE install (30 plugins!). Installation halts and throws 2 warnings:
Warning: array_combine(): Both parameters should have an equal number of elements in moodle\mod\survey\template\collesactualpreferred\lib.php on line 151
surveytemplate_criticalincidents

However, these warnings do not prevent Survey2 from being correctly installed.

Warning: array_combine(): Both parameters should have an equal number of elements in moodle\mod\survey\template\criticalincidents\lib.php on line 79