Fix lint check + update lint script (#224)

* Fix PEP8 E301 on nyaa/models.py

* Add utils/ to lint checker

* Run of lint.sh + manual fixes

As suggested https://github.com/nyaadevs/nyaa/pull/157#issuecomment-305051428

* Fix backwards tick in README

* Updated script

* Update Travis config

lint.sh

@@ -1,6 +1,51 @@
-autopep8 nyaa/ \
-	--recursive \
-	--in-place \
-	--pep8-passes 2000 \
-	--max-line-length 100 \
-	--verbose
+# Lint checker/fixer
+
+check_paths="nyaa/ utils/"
+max_line_length=100
+
+function auto_pep8() {
+  autopep8 ${check_paths} \
+    --recursive \
+    --in-place \
+    --pep8-passes 2000 \
+    --max-line-length ${max_line_length} \
+    --verbose
+}
+
+function check_lint() {
+  pycodestyle ${check_paths} \
+    --show-source \
+    --max-line-length=${max_line_length} \
+    --format '%(path)s [%(row)s:%(col)s] %(code)s: %(text)s'
+}
+
+# MAIN
+action=auto_pep8 # default action
+for arg in "$@"
+do
+  case "$arg" in
+  "-h" | "--help")
+    echo "Lint checker/fixer"
+    echo ""
+    echo "Usage: $0 [-c|--check] [-h|--help]"
+    echo "  No arguments : Check and auto-fix some warnings/errors"
+    echo "  -c | --check : only check lint (don't auto-fix)"
+    echo "  -h | --help  : show this help and exit"
+    exit 0;
+    ;;
+  "-c" | "--check")
+    action=check_lint
+    ;;
+  esac
+done
+
+${action} # run selected action
+result=$?
+
+if [[ ${action} == check_lint ]]; then
+  if [[ ${result} == 0 ]]; then
+    echo "Looks good!"
+  else
+    echo "The code requires some changes."
+  fi
+fi