species v0.02

• Restructuring of the package.
• MCMC and chi-square fitting routines.
• Plot functions for the MCMC analysis.
• Query functions to SIMBAD and VIZIER.
• Boxing of results with core.box.
• Data retrieval of SpeX, IRTF, vlm-plx, DRIFT-PHOENIX, and Vega.
• Tools to analyse model spectra.