#110 Additional NP files with and without SYNC channel

This PR includes additional NP data recorded with Open Ephys and SpikeGLX.

New files:

Open Ephys

• v0.6.x_neuropixels_with_sync: Dataset recorded with SYNC channel enabled

SpikeGLX

NP2_data recorded with commercial version of NP2 4 shanks (probe type 2013).

• NP2_with_sync: 385 channels, last is sync
• NP2_no_sync: 384 channels, without sync
• NP2_subset_with_sync: 121 channels, last is sync

Hi @alejo91! Thanks for the contribution! Everything looks good to me, I only added two commits to lock the files.