Test under ActiveRecord 3.2
Revert https://github.com/rtomayko/replicate/pull/20
Reset associations after loading to allow GC
Avoid following belongs_to associations that have already been dumped

This shaved a ton of SQL CACHE hits + AR object creation on my large
test database.
Use newer Reflection#target= where supported
Use Reflection#reset instead
Use either Base#association or #association_instance_set
Merge pull request #24 from rtomayko/gc-tune

Dump faster with more predictable RES mem growth
Dump-time options to include/omit associations

This reverts commit ce3cfefb9a55b050f8cb8b579b425cf80318fe44.

Conflicts:
	lib/replicate/active_record.rb
Tests for custom dumping and loading
Check arity before calling dump_replicant
More descriptive instance variable in AR
Merge branch 'test_3_2'