contour compatibility with lodash 4 [was: 3]

[mmrj]

@drosen0 says there are changes to defaults between lodash2 and lodash3, so needs careful review of contour code.

also, will allow backbone update (?).

[drosen0]

Contour uses this subset of lodash:

_.add
_.addResult
_.afterEach
_.all
_.any
_.beforeEach
_.bind
_.call
_.cloneDeep
_.compact
_.contains
_.defaults
_.description
_.each
_.exec
_.execute
_.extend
_.filter
_.find
_.first
_.flatten
_.groupBy
_.initial
_.intersection
_.invoke
_.isArray
_.isDate
_.isFunction
_.isNaN
_.isNumber
_.isObject
_.isString
_.keys
_.last
_.length
_.log
_.map
_.max
_.merge
_.min
_.noop
_.omit
_.partial
_.partialRight
_.pluck
_.push
_.range
_.reduce
_.result
_.select
_.skipped
_.sortBy
_.splice
_.template
_.times
_.toLowerCase
_.union
_.uniq
_.unique
_.unshift