This commit adds a new utility method which will take
a hash or an array and recursively turn any discovered
hash keys from string keys into symbol keys and return
the symbolized hash.

Prior to this commit rubocop runs in Travis failed on
a renamed cop.

…tes_docs

(MAINT) Fix mis-spelling in escape_quotes docs

…sh_keys

(FEAT) Add method for symbolizing hash keys

(MAINT) Update rubocop config

Mergeback 0.2.0 Release

Prior to this commit the hash key casing methods,
snake_case_hash_keys and pascal_case_hash_keys,
only properly handled hashes, not hashes inside
arrays or other objects.

Now, if passed an array, the methods will iterate
over each item in the array, recursively casing
any keys discovered in hashes. Additionally, they
will not error if passed any objects which are not
hashes or arrays; instead, they will return that
object as-is.

This commit standardizes the hash util methods on taking object
as a parameter as they handle more data types than just hashes.

It also conforms the hash util methods to use the same underlying
structure by utilizing a new private method, apply_key_mutator,
to do the heavy lifting. The other hash utility methods now create
a proc for the conforming of the keys and pass that to the mutator.

This commit updates the casing methods to handle symbols
if passed them - they will return a string if given a
string and a symbol if given a symbol, properly cased.

This does away with the weird requirement to cast the
keys to strings, case them, and resymbolize them in the
hash mutation procs.

…hods_arrays

(FEAT) Ensure hash key casing methods work on arrays

(MAINT) Release prep for 0.3.0