minor spelling/grammar fixes

src/jekyll/index.html

@@ -192,7 +192,7 @@ <h3>Only what you need.</h3>
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-                     Sbt will only compile source code that has changed and when nessessary. Why wait around for something to be recompiled when you can be doing more productive work?
+                     Sbt will only compile source code that has changed and when necessary. Why wait around for something to be recompiled when you can be doing more productive work?
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@@ -214,7 +214,7 @@ <h3>Do repeat yourself.</h3>
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-                     All build tasks and commands can be re-triggered when dependant source code changes by prepending the <code>~</code> modifier, leaving you free to focus on your craft and not on life-wasting repetition.
+                     All build tasks and commands can be re-triggered when dependent source code changes by prepending the <code>~</code> modifier, leaving you free to focus on your craft and not on life-wasting repetition.
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@@ -286,7 +286,7 @@ <h3>Why wait?</h3>
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-                     By default, build tasks that do not depend on one another in execute parallel. This also applies to your tests. Instead of sequentially executing your tests, Sbt will run them in parallel.
+                     By default, build tasks that do not depend on one another execute in parallel. This also applies to your tests. Instead of sequentially executing your tests, Sbt will run them in parallel.
                    ...something about parallel task execution...
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@@ -304,7 +304,7 @@ <h3>Simply dependable.</h3>
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-                     Close your eyes. Now open them. You no longer have to manage your dependencies in XML. Sbt provides a simple declarative dsl for weaving together what your library dependencies on and takes care of the rest.
+                     Close your eyes. Now open them. You no longer have to manage your dependencies in XML. Use a simple declarative DSL to add dependencies and sbt takes care of the rest.
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