Delay & force embedded directly inside cons-cells
Lazy list / delayed evaluation
Update README.md
Merge branch 'master' of github.com:rm-hull/yalix into feature/lazy-lists

* 'master' of github.com:rm-hull/yalix:
  Changed raising KeyError -> ValueError (Python3 compat)
  Added Python 3.4 as a build target to travis CI
  Prunes shadow bindings when extending environments; Improved error checking when creating lambdas Added Requirements.txt / Coverage metrics Added more tests for better coverage
  Update doc
  Tests compatible with Python3
  Tests compatible with Python3
  Fix test
  Python3 compatibility
  Travis builds 2.7 upwards
  Added some unit tests
  Travis config
  More typos
  Typos
  Added more doc
  Added intro text

Conflicts:
	src/python/yalix/interpreter/builtins.py
Merge branch 'feature/lazy-lists' of github.com:rm-hull/yalix into feature/lazy-lists

* 'feature/lazy-lists' of github.com:rm-hull/yalix:
  Update README.md
Implemented docstring; DRY tidy-up on DefineFunction
Merge branch 'feature/doc-strings' of github.com:rm-hull/yalix into develop

* 'feature/doc-strings' of github.com:rm-hull/yalix:
  Implemented docstring; DRY tidy-up on DefineFunction

Conflicts:
	README.md
	src/python/lib/core.ylx
	src/python/yalix/globals.py
	src/python/yalix/parser.py
	src/python/yalix/test/interpreter_test.py
Removed print
Both nil and symbols are atoms
An s-expression can be an empty list
Represent an s-expr as a list in quoted form
Add some quoting tests
Bug: variadic arg was being evaluated from extended env, NOT supplied env
Debug tracing and mostly working REPL printing
Common environment maker
Add missing code markers
Edits & fix typos
Spaces/tabs malfunction
Stupid git
Merge branch 'develop' of github.com:rm-hull/yalix

* 'develop' of github.com:rm-hull/yalix:
  Stupid git
  Spaces/tabs malfunction
  Edits & fix typos
  Add missing code markers
  Common environment maker
  Debug tracing and mostly working REPL printing
  Bug: variadic arg was being evaluated from extended env, NOT supplied env
  Add some quoting tests
  Represent an s-expr as a list in quoted form
  An s-expression can be an empty list
  Both nil and symbols are atoms
  Removed print
  Implemented docstring; DRY tidy-up on DefineFunction
  Update README.md
  Lazy list / delayed evaluation
  Delay & force embedded directly inside cons-cells