Bossdata

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* Fix issues 27 28 63 64 68
* New command-line options include:

* bossplot: --platefile, --flux-range, --wlen-range, --wdisp-range, --label-pos, --no-grid, --show-invalid
* bossfetch: --platefile

* Adds support for spPlate files and platelist metadata.
* Adds command-line options to customize bossplot axes, add labels and grids, and display invalid data.
* General documentation cleanup.
* Better error handling in bossplot.

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* Fix issues 11 36 41 43 45 50
* New command-line options include:

* bossfetch: --plate-name, --mjd-name, --fiber-name
* bosscatalog: --quasar-catalog, --quasar-catalog-name

* The main new functionality is support for querying the quasar catalog, using different data sources, and built-in defaults for any of the four environment variables that is not set.

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* Fix issues 2 10 16 18 19 21 24
* New command-line options include:

* bossfetch: --globus, --dry-run
* bossplot: --save-data
* bossquery: --sort

* The main new library functionality is support for using wavelengths and dispersions encoded as "trace sets" in spFrame files via :class:`bossdata.plate.TraceSet`.

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* Really fix issues 9 13.
* Add support for finding and fetching spFrame and spCFrame files (17).

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* Fix issues 9 12 13

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* Fix issues 3 5 6
* Add support for accessing subtracted sky flux to the `spec` module and `bossplot` script.
* This version breaks backwards compatiblity with 0.1.0 since the previous `$BOSS_SAS_ROOT` environment variable is now named `$BOSS_SAS_PATH` and has the instrument name (usually `boss`) appended.
* bash users can update by replacing `export BOSS_SAS_ROOT=/sas/dr12` with `export BOSS_SAS_PATH=/sas/dr12/boss` in their `.bashrc` file.