Adding LegacyExpense to import, in progress

Cleaned up legacy.task
Added total time to output of import
Fixed run time in legacy.rake
Working on LegacyExpense import
DRY up legacy.rake

make all import use method
Added description to mass attributes
Created taks to test Expense validation separate from import

Import takes a long time. Now I can run import and run the test
validation separately without delete imported data