New features and bug fixes

- Modifications made to the request package. Planned improvements will be
sending requests on intervals, rate limiter back off support, dynamic tuning
and requests packaged into a request job group.
- Can modify each exchanges individual HTTP client (e.g timeout and
transport settings).
- Bot now uses an exchange config HTTP timeout value.
- Bot now uses a global HTTP timeout (configurable).
- Batched ticker request support for exchanges.
- Ticker and Orderbook fetching now are spanned accross multiple
go routines and regulated by a sync wait group.
- Fixes hack used to load exchanges, now uses a sync wait group.
- Ticker and Orderbook storage and fetching now uses mutex locks.
- New pair function for finding different pairs between two supplied
 pair arrays. This is used for currency pair updates for exchange which
support dynamic updating.
- Shows removal/additions of dynamic updates currencies.

common/common_test.go

@@ -281,6 +281,26 @@ func TestStringDataCompare(t *testing.T) {
 	}
 }
 
+func TestStringDataCompareUpper(t *testing.T) {
+	t.Parallel()
+	originalHaystack := []string{"hello", "WoRld", "USDT", "Contains", "string"}
+	originalNeedle := "WoRld"
+	anotherNeedle := "WoRldD"
+	expectedOutput := true
+	expectedOutputTwo := false
+	actualResult := StringDataCompareUpper(originalHaystack, originalNeedle)
+	if actualResult != expectedOutput {
+		t.Errorf("Test failed. Expected '%v'. Actual '%v'",
+			expectedOutput, actualResult)
+	}
+
+	actualResult = StringDataCompareUpper(originalHaystack, anotherNeedle)
+	if actualResult != expectedOutputTwo {
+		t.Errorf("Test failed. Expected '%v'. Actual '%v'",
+			expectedOutput, actualResult)
+	}
+}
+
 func TestStringDataContainsUpper(t *testing.T) {
 	t.Parallel()
 	originalHaystack := []string{"bLa", "BrO", "sUp"}