FEATURES IN VERSION 1.4.1
o Fixed an error n the vigentte due to chnages in tidyr package.

FEATURES IN VERSION 1.13
-----------------------
o Now the tool also calculates the fold-change and give it in the output.
o Users now have the option to enter background genes for tissue-specific gene enrichment.

FEATURES IN VERSION 1.10
-----------------------
The TissueEnrich package is used to calculate enrichment of tissue-specific genes in a set of input genes. For example, the user can input the most highly expressed genes from RNA-Seq data, or gene co-expression modules to determine which tissue-specific genes are enriched in those datasets. It has the following three functions.

    o "teEnrichment": Given a gene list as input, this function calculates the tissue-specific gene enrichment using            tissue-specific genes from either human or mouse RNA-Seq datasets.
    o "teGeneRetrieval": Given gene expression data across tissues, this function defines tissue-specific genes by using        the algorithm from the HPA.
    o "teEnrichmentCustom": Given a gene list and tissue-specific genes from teGeneRetrieval as input, this function            calculates the tissue-specific gene enrichment.
