TST: clean up pysat install on travis

[jklenzing]

Description

Pysat 2.1.0 is now available via pip. There is no longer a need for the custom pysat install, so the pysat family of codes is being upgraded to a "standard" installation through pip. This will allow the no_sgp4 branch of pysat to be deleted.

Type of change

• Test environment update

How Has This Been Tested?

Updates to Travis-CI environment, so tested there.

Checklist:

• [x] Make sure you are merging into the develop (not master) branch
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [ ] Add a note to CHANGELOG.md, summarizing the changes

[jklenzing]

Recurring error in python 3.x tests on travis:

ModuleNotFoundError: No module named 'pysat.instruments.pysat_testing'

[jklenzing]

Seems to be an issue with the local install of pysat. Tested on my computer (python 3.7.3, pandas 0.24.2) and everything works fine with the pip-installed version of pysat 2.1.0.

[jklenzing]

Seems to be an issue with the local install of pysat. Tested on my computer (python 3.7.3, pandas 0.24.2) and everything works fine with the pip-installed version of pysat 2.1.0.

Problem solved: the pip installed version does not include the testing instruments.

[jklenzing]

Rewriting to use master branch from git.

[jklenzing]

Two new updates based on Travis CI config validation suggestions:

• Specify os as linux
• matrix has been replaced by jobs

[jklenzing]

Closing this in lieu of changes in #16