Fixed issues #14 and #15 relating to handling model formulas without amp_acro() components.

Update import from glmmTMB which previously failed with released version.

Perform the glmmTMB's .onLoad() when GLMMcosinor is loaded by including an @importFrom glmmTMB in pkg documentation.

Plot labels now correspond to the name of the group(s), and they are more concise.

Component labels have been removed from polar_plot() when there is only one component in the model.

Successful peer review from rOpenSci!

Create a sigma() function which gets the dispersion parameter from a given cglmm model (by calling glmmTMB::sigma()).

Improve introduction to cosinor modelling in the getting-started vignette.

Fix small typos in vignettes/docs and make plot legend title consistent across autoplot() and polar_plot().

Rename functions to be snake_case and all S3 class names to camelCase.