Ability to configure globs and globally excluded paths

[veelenga]

• add the ability to configure globs:

Examples:

! means exclude (as it works for Excluded section at rule level)

Globs: **/*.cr

Globs:
  - "**/*.cr"
  - "!spec/server/*.cr"

# defaults to

Globs:
  - "**/*.cr"
  - "!lib"

• add the ability to exclude globally (meaning exclude from globs):

Excluded:
  - spec
  - src/server/*.cr

• document sections

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should close #124