Merge branch '59-add-editorconfig' into 'master'

[TASK] Add .editorconfig

Closes #59

See merge request !46

.editorconfig

+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+charset = utf-8
+
+# Get rid of whitespace to avoid diffs with a bunch of EOL changes
+trim_trailing_whitespace = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# CSS-Files
+[*.css]
+indent_style = tab
+indent_size = 4
+
+# HTML-Files
+[*.html]
+indent_style = tab
+indent_size = 2
+
+# TMPL-Files
+[*.tmpl]
+indent_style = tab
+indent_size = 4
+
+# LESS-Files
+[*.less]
+indent_style = tab
+indent_size = 4
+
+# JS-Files
+[*.js]
+indent_style = tab
+indent_size = 4
+
+# JSON-Files
+[*.json]
+indent_style = tab
+indent_size = 4
+
+# PHP-Files
+[*.php]
+indent_style = space
+indent_size = 4
+
+# ReST-Files
+[*.rst]
+indent_style = space
+indent_size = 3
+
+# MD-Files
+[*.md]
+indent_style = space
+indent_size = 4
+
+# YAML-Files
+[{*.yaml,*.yml}]
+indent_style = space
+indent_size = 2
+
+# package.json or .travis.yml
+[{package.json,.travis.yml}]
+indent_style = space
+indent_size = 2
+
+# TypoScript
+[*.ts]
+indent_style = space
+indent_size = 2
+
+# XLF-Files
+[*.xlf]
+indent_style = tab
+indent_size = 4
+
+# SQL-Files
+[*.sql]
+indent_style = tab
+indent_size = 2
+