Add travis script and gitattributes

.gitattributes

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+*     text eol=lf
+
+*.ico binary
+*.jpg binary
+*.png binary
+*.zip binary
+*.mp3 binary
+*.gif binary

.travis.yml

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+language: python
+python: "3.7"
+script:
+- python3 travis.py

travis.py

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+from pathlib import Path
+import sys
+
+errors = []
+
+
+def find_all(a_str, sub):
+    for i, line in enumerate(a_str.splitlines(keepends=False)):
+        column = 0
+        while True:
+            column = line.find(sub, column)
+            if column == -1:
+                break
+            yield i, column
+            column += len(sub)
+
+
+for f in sorted(Path('.').glob('*.rst')):
+    try:
+        content = f.read_text('utf-8')
+    except UnicodeDecodeError:
+        errors.append("File {} is not readable as UTF-8. Please set your editor to UTF-8 mode."
+                      "".format(f))
+    for line, col in find_all(content, '\t'):
+        errors.append("File {} contains tab character on line {}:{}. "
+                      "Please convert tabs to spaces.".format(f, line, col))
+    for line, col in find_all(content, '\r'):
+        errors.append("File {} contains windows newline on line {}:{}. "
+                      "Please set your editor to unix newline mode.".format(f, line, col))
+
+for error in errors:
+    print(error)
+
+sys.exit(len(errors))