locally install R/bioconductor package

Locally install R/bioconductor package, means not link to web in the process of packages installaion. This is really easy for warm hands, but not for a new comer.

Here, an example. install a packages created by myself, the package tar.gz file is "BSgenome.Alyrata.JGI.v1_1.0.tar.gz".

install.packages(pkgs="BSgenome.Alyrata.JGI.v1_1.0.tar.gz", repos=NULL)