ENH: add condition count to Epochs __repr__

This in part addresses #338
ENH: more efficient count, break after 30 chars + add '...'
COSMITS
ENH: condition names as strings
ENH: endles list at the end + newline
ENH: raw string formatting
ENH: Faster morphing
FXI: tutorial.rst
Merge pull request #459 from dengemann/epochs_repr_count

ENH: add condition count to Epochs __repr__
STY: Cleaning up
STY: Cleaning up
FIX: Minor fix
Merge pull request #462 from Eric89GXL/morph-speedup

ENH: ~20% speedup in morphing
DOC: find_events
Merge pull request #464 from christianmbrodbeck/doc

DOC: find_events
FIX: more reasonable file name handling

The expansion is now smarter and hopefully meets the POLS
Merge pull request #467 from dengemann/bti_fname_check

FIX: more reasonable file name handling
FIX: addresses #468 offset problem

Closes #468.
COSMITS
Merge pull request #469 from dengemann/bti_fname_check

FIX: addresses #468 offset problem