Ncbi-submit

Changed
* fastq.gz files are allowed (instead of just fastq files)

Changed
* fixed check for excludables
* fixed filling na as bioproject
* minor printout adjustments
* minor cleanup

Changed
* fixed readme
* fixed missing text with unimplemented `_offer_skip_option`

Changed
* Readme reflects new behavior
* Readme improved
* improved setup.py
* fixed a helper function

Changed
* `./example` dir is actually included, now

Added
* Made config.py/template.sbt accessible
* Can now create (semi-)generic config & template files via `ncbi_submit example`
* `./example` dir should now be part of package
Changed
* Now check that outdir is not a file and create before doing much else
Removed
* `./config` directory - merged contents into `./example`