Add examples in help files for finer-scale data (e.g., block)

[mtreg]

This is a great package - thanks for your great work on it!

Particularly for folks new to the US Census API it would be helpful to have some more examples - in particular, for getting data at as fine as tract or block level. I've included an example below for Census block in case you'd like to include, and could also issue pull request if you prefer - just let me know.

data2010 <- getCensus(name="sf1", 
vintage=2010,
key=censuskey, 
vars=c('PLACE','P0010001', 'P0030001', 'BLKGRP'), 
region="block:*", regionin='state:36+county:27')

[hrecht]

Thanks, a pull request would be great!

[mtreg]

Just following-up on this - submitted a pull request with updates to README and the getcensus_functions.R file (formatted appropriately for ROxygen2)

[hrecht]

Thanks @mtreg, sorry for the slow response. I haven't had a chance to review and run tests yet but as soon as I can turn back to the package I will. Looks good on Github.

[hrecht]

Addressed in #8 and 164d07d