Merge branch 'release/0.8.1'
Merge branch 'develop'
added quote parameter to DelimitedScheme and a csv value source
Added combinations(n,k) to RichPipe
Fixed bug in combinations(n,k)
Fixed read bug in combinations(n,k)
Moved combinations out of RichPipe to mathematics package, added permutations
Using IndexedSeq as opposed to Array, as per Oscar
add addTrap to richPipe  - can add cascading traps to a rich pipe
Allow DefaultDateRangeJob to optionally take a --period (or --daily or --weekly)

--period determines how many days each job runs over (rather than over the whole date range)
--daily and --weekly are aliases for --period 1 and --period 7 respectively
Added functionality to generate tuples with repititions that satisfy some predicate
Changes as per Oscar
Simplified permutations & combinations logic
Added weightedSum(..) for portfolio mgmt
A new much faster version of weightedSum
A new much faster version of weightedSum
Adds sum method to typed pipe
Merge pull request #231 from johnynek/feature/typed-pipe-sum

Adds sum method to typed pipe
Removed dangers implicit conversions from TypedPipe <=> Grouped
Merge pull request #233 from johnynek/bugfix/repair-sum-damage

Removed dangerous implicit conversions from TypedPipe <=> Grouped