ENH: Trial identification scheme
FIX: Test for id_types
ENH: Improve test coverage
FIX: Fix EL test
FIX: Fix EL test for systems with real EL
FIX: EL tests
ENH: Improve test coverage
FIX: Fix EL test
FIX: Fix warning
Merge pull request #105 from Eric89GXL/trial-id

all tests pass here (including no openGL context errors, for a change)