add some more asserts for build_key_value

fix tests & issue
Added power-digits-sum-test + generated issue
Merge pull request #48 from vyorkin/build_key_value

add some more asserts for build_key_value
Merge pull request #46 from Makapoxa/power-digits-sum

Added power-digits-sum-test
Added fibo issue + test, minor code refactoring
Merge pull request #50 from Makapoxa/fibo-finder

Added fibonacci test + generated issue
Added twenty-one
Merge pull request #51 from aelaa/twenty-one

Added twenty-one
Added pascals_triangle_test + generated issue
Merge pull request #52 from Makapoxa/pascals_triangle

Added pascals_triangle_test + generated issue
Added flatten
Merge pull request #53 from aelaa/flatten

Added flatten
Added happy numbers test + generated issue, minor code formatting fix
add kibit
Merge pull request #54 from Makapoxa/happy_numbers

Added happy numbers test + generated issue
add parse_http_post_params issue
Merge pull request #45 from vyorkin/parse_http_post_params

add parse http post parameters issue
Added more-than-medium
Merge pull request #57 from Krotos/more_than_medium

Added more-than-medium
Added integer-difference