Added new cleanBIAT function and edited the instruction for original cleanIAT function

[Diheng]

1. Edited the instruction for original cleanIAT function, changed the order of blocks in the second half of the example to get the correct direction.
2. Added a new cleanBIAT function. I can't really figure out what standard evaluation is, so I adjusted the original cleanIAT function form but used the algorithm from Brian Nosek (2014) to write the cleanBIAT function. Reference and instruction are added.
3. The cleanBIAT function was tested with two BIAT dataset from PIMH. Will continue to test it in daily lab usage.

Thanks!

[dpmartin42]

@Diheng You're referencing a "BIATData", but it's not included in the data folder. If you have a sample dataset, can you upload it to this folder? Or can you just use the traditional IATData that's already uploaded?

[Diheng]

Hi Dan,

Just uploaded a sample BIAT dataset and updated the example in cleanBIAT to match with the provided sample dataset. Thanks!

Best,
Diheng