set cache path using env var (#274) #302
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updated
cache_path()to query environment variableCLIMR_CACHE_PATHand use that if set; alternatively, the optionclimr.cache.pathcan be set by the user and takes precedence.updated corresponding documentation, and added example code.
NOTE: I did not implement a generic mechanism to use env vars / options, but the code I added here could (I think) be easily generalized to implement a common approach for setting other package options.