Add pre-parse module

[rodrigosiqueira]

Add pre-parse to Kuniri to handle basic stuffs before it starts to parse all the code. The first thing to handle is multiple lines with "+".
For example:

stringLa = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer nec odio." +
  "Praesent libero. Sed cursus ante dapibus diam. Sed nisi. Nulla quis sem at nibh elementum" +
"imperdiet. Duis sagittis ipsum. Praesent mauris. Fusce nec tellus sed augue semper"

It is important to build a specific structure for pre-parse, because we will find many other cases in the future to add to this part.

[rodrigosiqueira]

This issue will solve #173

[rodrigosiqueira]

New stuffs for pre-parser:

1. Convert 'do ... end' to '{...}' in all cases
2. Join break lines with '+'
3. Remove comments and save it in a hash
4. Handle blocks divided in different lines to a common syntax. E.g.:

lambda do |x, y|
...
end

lambda do
|k,l|
end

lambda do |
x, y|
end