[* Currency] Handle mentions in the forms "negative <currency>" or "-$<number>"

[zmerpez]

Platform: Python [1.0.2a2]
recognize_currency does not work for text like "negative $10". When tried recognize_number with some text that has both negative and $ sign, that divides the number wrong and fails to get all.

To Reproduce

from recognizers_suite import Culture, ModelResult
import recognizers_suite as Recognizers
culture = Culture.English

result_2 = Recognizers.recognize_number('negative $71.5 million or -$23.', culture)
print(
    'Returns:\n',
    json.dumps(
        result_2,
        default=lambda o: o.__dict__,
        indent='\t',
        ensure_ascii=False)
)

Returns:

[
   {
   	"start": 0,
   	"end": 20,
   	"resolution": {
   		"value": "-71.5"
   	},
   	"text": "negative $71.5 millio",
   	"type_name": "number"
   },
   {
   	"start": 0,
   	"end": 10,
   	"resolution": {
   		"value": "-7"
   	},
   	"text": "negative $7",
   	"type_name": "number"
   }
]

Expected behavior
values should be: -71500000, -23

[zmerpez]

Best guess, that the functions does not work fine with word 'negative': i.e. I could get desired results from
"a negative impact on the strengthening of the $32" only if I place some brakets around word.
"a [negative] impact on the strengthening of the $32"