Fix mis-aligned full bleed background content

Fixes #196

Author: TedGoas

cerberus-fluid.html

@@ -368,7 +368,7 @@ <h2 style="margin: 0 0 10px 0; font-family: sans-serif; font-size: 18px; line-he
         <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="100%" style="background-color: #709f2b;">
             <tr>
                 <td valign="top">
-                    <div style="max-width: 600px; margin: auto;" class="email-container">
+                    <div align="center" style="max-width: 600px; margin: auto;" class="email-container">
                         <!--[if mso]>
                         <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="600" align="center">
                         <tr>

cerberus-hybrid.html

@@ -705,7 +705,7 @@ <h2 style="margin: 0 0 10px 0; font-family: sans-serif; font-size: 18px; line-he
         <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="100%" style="background-color: #709f2b;">
             <tr>
                 <td valign="top">
-                    <div style="max-width: 680px; margin: 0 auto;" class="email-container">
+                    <div align="center" style="max-width: 680px; margin: 0 auto;" class="email-container">
                         <!--[if mso]>
                         <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="680" align="center">
                         <tr>

cerberus-responsive.html

@@ -556,7 +556,7 @@ <h2 style="margin: 0 0 10px 0; font-family: sans-serif; font-size: 18px; line-he
 	    <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="100%" style="background-color: #709f2b;">
 	        <tr>
 	            <td valign="top">
-	                <div style="max-width: 600px; margin: auto;" class="email-container">
+	                <div align="center" style="max-width: 600px; margin: auto;" class="email-container">
 	                    <!--[if mso]>
 	                    <table role="presentation" cellspacing="0" cellpadding="0" border="0" width="600" align="center">
 	                    <tr>