OpenSignals File Format Reader for BITalino

Utility code to help load BITalino files stored using OpenSignals

Using this function people can easily load data recorded with BITalino (http://www.bitalino.com) and stored using the OpenSignals file format. The header is loaded as a dictionary on the Matlab environment to facilitate the access to the metadata, and the data frames are loaded as a matrix that can be easily manipulated.