Pluralise regular expression. Change colour feedback. Make $nick a variable.

**Pluralize 'regular expression(s)' to indicate you may submit more than one expression.**
```
(05:04:30) <nasonfish> techkid6, I can't tell if you know this or not but you can submit as many regexes as you want for each round, it takes the highest scoring one and uses it
(05:06:18) <techkid6> nasonfish: at first I DIDN'T know this
(05:06:22) <nasonfish> okay, just checking, some people make the mistake of only submitting one
(05:06:24) <techkid6> then like, 10 rounds in, someone told me :P
```
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**Alter colours regolf uses to return feedback**

This alters the colours regolf uses to return feedback from green for correct, and none for incorrect to the following:
  Correct hit: dark green (03)
  Missed hit: dark gray (14)
  Hit wrong word: red (04)
  Missed wrong word: dark gray (14)

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**Make bot-nick a variable**

Furthermore, this makes $nick a variable, this is used in the string 'regular expression(s) using /msg $nick expression'
 So that the actual name will be messaged; not a static string.