Mob-suite

* Removed the requirement for circlator due to issues with installing that package and have implemented a blast based method for detecting circular overhangs of contigs.
* Significantly improved assignment of contigs where a close reference sequence is in the database
* Fixed issue 35
* Fixed issue with MOB-cluster writing the incorrect level of clustering to fasta files

* Fixed issue 36 by making removing all non-ascii characters in the database file and removing any potential printing to the screen avoiding `UnicodeEncodeError`
* Fixed issue 35 with software version displayed as `2.0.5` without any braces
* Fixed logging level inheritance from the root logger.
* Fixed issue 41 avoiding mean calculation on non int or float values

* Made mob_suite independent of the system locale and character encoding settings
* moved all ete3 databases to the tool `/databases/` folder for easy maintenance and compatibility.
* improved ete3 initialization routines inside `mob_hostrage` module preventing race condition
* added `--version` switch to all tools
* addressed issues issue 35, 36, 38 , 39 and 40

* This version improves on stability of the 2.0.0 version by removing dependency on `TreeStyle` submodule from the `ete3` library which caused some issues on the server machines without `mesa` graphical libraries (see issue 28)
* Implemented folder lock functionality for the `mob_init` script preventing race condition on multiple `mob_suite` initialization instances
* Implemented test function for conda package testing
* Corrected issue 29 allowing `mob_init` to initialize `ete3` library taxonomy
* Included singularity image recipe and updated `README.md`

Added plasmid host range and transfer rate predictions. Corrected previous bugs related to a) empty mob_aggregate_report.txt when running mob_recon; b) results reporting for multi-replicon plasmids;

Previous FigShare mirror changed. We added new mirror at shared.corefacility.ca host allowing for faster downloads and better reliability. Now we have two download mirrors at `share.corefacility.ca` and `ndownloader.figshare.com`. As per user requests we've added ability to specify reference databases directory via the `--database_directory` and other parameters (see command-line help).