Add text processing package

[vladimirvivien]

When the Proc package returns its results as text, there needs to be a text processing package that allows parsing, tokenization, and columnar/tabular access to text (think awk).

text.Tok(exec.Run("command")).Lines(2).Words(10).String()

For instance, in the previous snippet:

• Func Tok(<string>) tokenizes the text
• Tok(<string>).Lines(2) returns the second line in the text
• Tok(<string>).Lines(2).Words(10) returns the tenth word from line 2.