added NCI-60 proteomics data

* nci60.expr.prot.RPLA.R provides csv formatted file on protein data from
CellMiner (low coverage of proteins)

* nci60.expr.prot.MS.R provides csv formatted file on protein data from
mass-spectrometry-based approach from 
http://129.187.44.58:7070/NCI60/main/download

* nci60_prot_MS_log10.rda saves protein data from
http://129.187.44.58:7070/NCI60/main/download
This step was necessary to me as the multi-sheet xlsx file on the website
was corrupted when I used the download_file() function.


In summary NCI-60 protein data returned by my scripts come into three
versions:
- 60 proteomes
- 60 kinomes
- 10 deep proteomes (one cell line by tissue)