Initialize dart-lang/tuple with the tuple package at v1.0.1.

CHANGELOG.md

Index: CHANGELOG.md
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+#### 1.0.1
+   * Fix all strong-mode warnings and errors.
+
+#### 1.0.0
+   * Remove _hash function and use quiver_hashcode package instead.
+
+#### 0.4.0
+   * Add fromList factory constructor.
+   * Add Tuple6 and Tuple7 classes.
+
+#### 0.3.0
+   * Add toList method.
+
+#### 0.2.0
+   * Rename PersistentTuple classes to Tuple; remove Tuple classes.
+   * Rename each iN item to itemN.
+   * Rename setIN to withItemN.
+
+#### 0.1.2
+   * Fix a bug in == operator of PersistentTuple classes.
+
+#### 0.1.1
+   * Add operator == and hashCode to classes, so that tuples may be used as
+     keys in hashes.
+
+#### 0.1.0
+   * Initial release.