OP-772: Enforce line ending agreements (git 1.7.2+ required for this to work)

This is a part of OP-726, OP-727 tasks to normalize source code.
Use the following to normalise your local repository to be able to merge:

git rm --cached -r .
git diff --cached --name-only -z | xargs -0 git add
git commit -m "Normalise line endings"
git ls-files -z | xargs -0 rm
git checkout .

.gitattributes

@@ -0,0 +1,31 @@
+#
+# Line endings normalization: http://wiki.openpilot.org/display/Doc/Coding+Style
+# You need at least git 1.7.2 for this to work (previous versions ignore text and eol attributes).
+#
+# Make sure you have committed all local changes first. Then use the following bash commands
+# to normalize your local repository to be able to merge it with a mainline:
+#
+# Minimal normalization:
+#   git rm --cached -r .
+#   git reset --hard
+#   git add .
+#   git commit -m "Normalize line endings"
+#
+# Or full normalization (don't do that on Windows, it breaks file modes):
+#   git rm --cached -r .
+#   git diff --cached --name-only -z | xargs -0 git add
+#   git commit -m "Normalize line endings"
+#   git ls-files -z | xargs -0 rm
+#   git checkout .
+#
+
+# Set default behaviour (do not convert line endings regardless of local git core settings)
+*		-text
+
+# All *.txt files in the root should be Windows-readable (CRLF)
+/*.txt		text eol=crlf
+
+# Root Makefile has LF line endings
+/Makefile	text eol=lf
+
+# More attributes are defined in per-directory .gitattributes which override this file

flight/.gitattributes

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+#
+# Flight source code files should always have LF line endings by agreement
+# http://wiki.openpilot.org/display/Doc/Coding+Style
+#
+
+*.c		text eol=lf
+*.h		text eol=lf
+*.py		text eol=lf
+
+*.s		text eol=lf
+*.S		text eol=lf
+*.ld		text eol=lf
+*.inc		text eol=lf
+
+Makefile	text eol=lf
+Makefile.*	text eol=lf
+*.mk		text eol=lf

ground/.gitattributes

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+#
+# Ground source code files should always have CRLF line endings by agreement
+# http://wiki.openpilot.org/display/Doc/Coding+Style
+#
+
+*.c		text eol=crlf
+*.cpp		text eol=crlf
+*.h		text eol=crlf
+*.hpp		text eol=crlf
+
+*.ui		text eol=crlf
+*.qrc		text eol=crlf
+*.qml		text eol=crlf
+*.pluginspec	text eol=crlf
+
+*.pri		text eol=crlf
+*.pro		text eol=crlf

make/.gitattributes

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+#
+# All make includes should have LF line endings to be consistent with flight code
+#
+
+*.mk		text eol=lf
+*.py		text eol=lf
+
+/templates/firmwareinfotemplate.c 	text eol=lf
+/templates/gcs_version_info_template.h	text eol=crlf
+/templates/*.txt			text eol=crlf

matlab/.gitattributes

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+#
+# Matlab files have LF line endings
+#
+
+*.m		text eol=lf
+*.mdl		text eol=lf

package/.gitattributes

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+#
+# Only Makefiles will have LF line endings
+#
+
+/*.mk		text eol=lf

shared/.gitattributes

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+#
+# Shared UAVObject definisiton should have LF line endings
+#
+
+/uavobjectdefinition/*.xml	text eol=lf