Stack challenge
Build the stack challenge
Initial commit
Reademe
Readme modified.
Wrote the weekend coding challenge
Modified README file regarding week1 coding challenge.
Modified proper_parenthetics to include more cases for when there are even number of parenthsis but not matching. There is still error when matching parenthesis dont come in order.
merging due to conflict error
Removed all the codes I did not work with Ian aka linked_list
Merge branch 'dll' of https://github.com/im-auld/data_structures into dll
stack.py. worked with Ian
 Binary heap, worked with Ian on it.

Merge branch 'binary' of https://github.com/im-auld/data_structures into heap
Merge branch 'priorityq'
Added requirement.txt and .travis.yml files.
Moved requirement.txt and .travis.yml to the propery directory
Changed the file name of requirement to requirements.txt
Modified the .travis.yml file.
Modified the .travis.yml file.
Modified ReadMe