Prepare/Load metadata into Gemma

[mbelmadani]

Addressing request from PavlidisLab/Gemma#20

For GEO datasets/expression experiments, we would like to obtain:

• The GSExxxxx
• Pipeline parameters (Assembly, software versions, etc)
• Fastq header information
• Alignment information (may not be straightforward with RSEM)

To start, let's produce a text file in a "METADATA" directory similar to the Data directory.

[mbelmadani]

Files are generated/moved over to the $METADATA location when the GatherMetadataGSE task is executed resolving the request from PavlidisLab/Gemma#20 in terms of the RNA-Seq pipeline.