plotGene: old coverage plot function.
In scottzijiezhang/MeRIPtools: Analyze MeRIP-seq data and QTL calling

old coverage plot function.

1 2	plotGene(IP_BAM, INPUT_BAM, size.IP, size.INPUT, geneName, geneModel, libraryType = "opposite", center = mean, GTF, ZoomIn = NULL)

`IP_BAM`	The bam files for IP samples
`INPUT_BAM`	The bam files for INPUT samples
`size.IP`	The size factor for IP libraries
`size.INPUT`	The size factor for INPUT libraries
`geneName`	The name (as defined in gtf file) of the gene you want to plot
`geneModel`	The gene model generated by gtfToGeneModel() function
`libraryType`	"opposite" for mRNA stranded library, "same" for samll RNA library
`GTF`	gtf annotation as GRanges object. Can be obtained by GTF <- rtracklayer::import("xxx.gtf",format = "gtf")