Fixed long lines in utils
Fixed long lines in carbon intensity
MSOA functions now support multiple years.
Fixed some typos in the README
Fixed long lines in decctools description
Added function to get valid LSOA years
Updated LSOA code to support multiple years
Added fix for year validation
Tidied LAD methods.  Full support for multiple years still missing.
Added support for multiple years to LAD functions
Merge branch 'update-urls' into develop
Moved a method in lsoa.r to allow for easier merging
Created common method for extracting valid SOA years
Created a common method for extracting SOA metadata
Created single function for parsing raw MSOA data
Removed directory from get_master_LSOA_params
Removed dir from get_master_MSOA_params
Changed custom_function arguments to column numbers.  Easier to maintain in a spreadsheet.
Converted data to load-on-demand
Moved LSOA parameters to a data file