Adding code to get header

[kmader]

adding header code

https://mybinder.org/v2/gh/chestrays/appmode/header-test?urlpath=%2Fmuapps%2Fmy_user_name%2Fexample_app.ipynb

[pep8speaks]

Hello @kmader! Thanks for updating the PR.

• In the file appmode/server_extension.py, following are the PEP8 issues :

Line 6:80: E501 line too long (83 > 79 characters)
Line 11:1: E302 expected 2 blank lines, found 1
Line 12:5: E265 block comment should start with '# '
Line 12:80: E501 line too long (80 > 79 characters)
Line 19:80: E501 line too long (80 > 79 characters)
Line 20:35: E225 missing whitespace around operator
Line 42:80: E501 line too long (97 > 79 characters)
Line 63:5: E265 block comment should start with '# '
Line 63:80: E501 line too long (80 > 79 characters)
Line 79:5: E265 block comment should start with '# '
Line 79:80: E501 line too long (80 > 79 characters)
Line 88:37: E228 missing whitespace around modulo operator
Line 98:1: E265 block comment should start with '# '
Line 98:80: E501 line too long (80 > 79 characters)
Line 99:1: E302 expected 2 blank lines, found 1
Line 101:80: E501 line too long (82 > 79 characters)
Line 102:5: E265 block comment should start with '# '
Line 102:56: W291 trailing whitespace
Line 112:80: E501 line too long (90 > 79 characters)
Line 116:1: E265 block comment should start with '# '