Creates matrix of beacounts from data read in using the minfi package. NAs represent probes with beadcount <3. An Extended RG Channel Set is required for this function to work.
450K methylation data read in using minfi to create an Extended RG Channel Set
A matrix of bead counts with bead counts <3 represented by NA for use in the pfilter function for quality control
The beadcount function is internal to the pfilter function
 Pidsley R, Wong CCY, Volta M, Lunnon K, Mill J, Schalkwyk LC: A data-driven approach to preprocessing Illumina 450K methylation array data (submitted)
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