rerddap 0.4.2

Now using hoardr to manage caching paths and such (#60). Also now asking users where they want to cache files, either in a rappdirs user cache dir or a temp directory. Now on tests and examples we use temp dirs.
Related to above, new functions cache_info() to get cache path and number of cached files, and cache_setup() to set cache path.
Related to above, cache_details(), cache_list(), and cache_delete() lose their cache_path parameter - now cache path is set package wide and we use the same cache path, so no need to set in the fxn call.

Fixes to a number of griddap() and tabledap() examples to use datasets that still exist (previous examples used datasets that are no gone)

rerddap 0.4.0

New vignette added that goes in to much more depth than the original vignette (#51) thx to @rmendels
info() function gains new attribute url with the base url for the ERDDAP server used (#42)
Replaced usage of internal compact data.frame code to use tibble package (#45)

Added another ERDDAP server to servers() function (#49)
Changed base URLs for default ERDDAP server from http to https (#50)
Added note to docs for griddap() and tabledap() for how to best deal with 500 server errors (#48)
Replaced all dplyr::rbind_all uses with dplyr::bind_rows (#46)

Removed use of ncdf package, which has been taken off CRAN. Using ncdf4 now for all NetCDF file manipulation. (#35)
Failing better now with custom error catching (#31)
Added many internal checks for parameter inputs, warning or stopping as necessary - ERDDAP servers silently drop with no informative messages (#32)

Using now file.info()$size instead of file.size() to be backwards compatible with R versions < 3.2

Cache functions accept the outputs of griddap() and tabledap() so that the user can easily see cache details or delete the file from the cache without having to manually get the file name. (#30)

All package dependencies now use importFrom so we only import functions we need instead of their global namespaces.

Fixed bug in parsing data from netcdf files, affected the griddap() function (#28)

Fixed a few cases across a number of functions in which an empty list passed to query parmaeter in httr::GET() caused an error (#23)
Fixed retrieval of path to file written to disk by httr::write_disk() (#24)
last is a value accepted by ERDDAP servers, but internal functions weren't checking correctly, fixed now. (#25)
as.info() wasn't passing on the url parameter to the info() function. fixed now. (#26)